Jacqtjes bohli



so, 1924. 115M437 J. BOHLI! ELECTRIC IGNITION APPARATUS FOR INTERNALCOMBUSTION ENGINES Filed April 1. 1924 isiaai ear no.

JACQUES BOHLI, or sono'rmmu, swI'rzERLANn, ASSIGNOR TO THE FIRMSCINT'ILLA,

. or SOLO'IHURN, SWITZERLAND.

ELECTRIC IGNITION AIPPAIRALTUS FOR INTERNAL-COMBUSTION ENGINES.

Application filed April 1, 1924. Serial No. 703,561.

To all whom it may concern:

Be it known that I, JACQUES BoHLI, a citizen of the Swiss Republic,residing at No. 304 Obach, Solothurn, Switzerland, have invented certainnew and useful- Improvements in Electric Ignition Apparatus forInternal-Combustion Engines, of which the following is a. specification.

In magneto-ignition apparatuses it has already been proposed to useelectro-magnets in place of the permanent magnets usually employedhitherto, and to excite such electro-magnets with current from abattery. With such an arrangement, the starting of the engineis effectedby simply switching the bafttery current into the primary winding 0 theignition apparatus by means of the interrupter, so that for this purposethe apparatus Works temporarily' with battery-ignition.

That arrangementhas many advantages from an economical and technicalpoint of view, since, more particularly when the battery has nearly rundown, a few hundredths of the normal battery voltage are suflicient toproduce and maintain an efieetive igniting spark.

The present invention has for its object to enable the lowest speed ofrotation at which an efi'ective igniting spark can still be producedwith the aforesaid arrangement, to be still further considerablyreduced, and thus facilitate the starting of the engine. With thisobject" an improved apparatus is provided according to the presentinvention, so designed, that when the interrupter (operated mechanicallyfrom the shaft of the ignition apparatus) is open, not .merely onesingle spark, but each time a whole series of igniting sparks will beproduced in rapid succession.

This object is achieved by inserting in the exciting circuit of theelectromagnets of the ignition apparatus an automatic electro-magneticbuzzer, that is, an automatic interrupter of the st 1e of a Wagnerhammer, which opens and clbses the exciting current circuit of theelectro-magnets in rapid succession so long as the interrupter of theignition apparatus (controlled mechanically from the shaft of the enginebeing started) is open.

A constructionalform of an ignition apparatus embodying the improvementsof this invention is illustrated by way of examcoil, and have theirdirection reversed at each half-revolution of the armature.

()n the core f are located the primary winding p and the secondarywinding 8 of the ignition coil. 9 is the interrupter located in theusual way in the circuit of the primary Winding p, and la is thecondenser connected in parallel with the said interrupter. h is thesparking plug located in the circuit of the secondary winding 8.

According to the present invention a buzzer Z operatingelectro-magnetically after the style of a Wagner hammer, is located inthe circuit of the exciting winding 6. The contacts n and 0 of the saidbuzzer interrupt the exciting current in rapid successionfand therebygenerate, not merely one single spark, but a whole series of sparks solong as the interrupter g (operated mechanically by a tappet) remainsopen.

m is a three-waychange-over switch. By

the engine. In position 3 of the switch m,

the engine having been started, the buzzer is by-passed, and theexciting current can flow from the battery directly into the ex citingwindin b. 1 i

What I clalm is I 1. An electric ignition apparatus for in ternalcombustionengines lncluding a pair of yoke members, a stationary ironcore connecting said yoke members and on which are mounted the usualprimary and secondary windings, a make and break device operatedmechanically by the engine and associated in the usual manner with saidprimary Winding, a sparking plug in series with said secondary Winding,an iron rotor and an electric circuit comprising in series connection amagnetizing coil on said rotor, a battery and a buzzer.

2. An electric ignition apparatus as claimed in claim 1, including meansadapted to short circuit the buzzer at will, said means including achange-over switclrand electrical connections thereto.

3. An electric ignition apparatus claimed in claim 1, including meansadapted to short circuit the buzzer or break the said series connectionto the battery at will, said means including a change-over switch andelectrical connections thereto.

In testimony whereof I have signed my name to this specification.

JACQUES BoHLI.

